My Kindle arrives on Tuesday (according to the shipping tracker). I am already convinced I want to make a custom case for it. Partly because I want it to suit my personality, partly because I am crafty like that and a little bored. For those of you that have made your own what do you use to stiffen it? I'm thinking either cardboard or plastic needlepoint mesh, but I'm worrid that neither will be sturdy enought to truly protect my device.